Hi, Its common to loose weight in Alzheimer s due to lower energy intake, higher resting energy expenditure, exaggerated physical activity (restlessness and agitation) and eating difficulty. Weight loss increases in severity and progression of Alzheimer s disease. Try to increase both nutrition and calories. At present, we can rule out low energy intake. The energy intake being given is for normal adults. It should be more in present condition. Try to consult a dietician for a proper diet Hope I have answered your query. If you have any further queries, happy to help.